A gas stove is a cooking device which uses natural gas, propane, butane, Liquefied petroleum gas or other flammable gas as a fuel source.
Since the gas pipe network was slow to develop, the success of the gas stove on a commercial level took some time to happen. Gas stoves were invented as early as the 1820′s as isolated experiments but it was not until the 1880′s that manufactured stoves were sold commercially. The first stoves were large and bulky, but over time they were reduced to fit better within home kitchens. Enamel was introduced as a coating for the stove in the 1910′s. This made the stoves easier to clean.
There are two types of ignition sources on stoves today. The standing pilot is a continuously burning small flame between the front and back burners that lights the burners when the gas is released. The pilot light, however, does continuously consume fuel and can be blown out. Early ovens did not have pilots and had to be lit manually. This could lead to gas leaks if the gas was left on and later leading to gas filling rooms and potentially causing explosions. Manufacturers developed a safety valve to counter act this problem. If the pilot light goes out then the safety, a thermocouple, signals the valve to close releasing no more gas.
The other type of ignition is the electric spark. The ignition will have a audible clicking sound when turned on. After turning the knob to lite then knob is then used to moderate the gas released and therefore moderates the size of the flame. There is also a safety mechanism on electric ignition that automatically relights a flame that goes out. A “glow bar” is used to ignite the gas. When a sensor detects that the glow bar is hot enough it opens the valve to let the gas out.